1. Postcard from Nicolai D. Ierusalimski to Joshua Lederberg Publication: Produced: 31 December 1959 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
2. Postcard from Ralph A. Lewin to Joshua Lederberg Publication: Produced: February 1959 Archival Collection: The Joshua Lederberg Papers (Profiles in Science)
